Pharmaceutical aspects of salt and cocrystal forms of APIs and characterization challenges

PC Vioglio, MR Chierotti, R Gobetto - Advanced Drug Delivery Reviews, 2017 - Elsevier
In recent years many efforts have been devoted to the screening and the study of new solid-
state forms of old active pharmaceutical ingredients (APIs) with salification or co …

NMR crystallography of molecular organics

P Hodgkinson - Progress in Nuclear Magnetic Resonance …, 2020 - Elsevier
Developments of NMR methodology to characterise the structures of molecular organic
structures are reviewed, concentrating on the previous decade of research in which density …

Chemical shifts in molecular solids by machine learning

FM Paruzzo, A Hofstetter, F Musil, S De… - Nature …, 2018 - nature.com
Due to their strong dependence on local atonic environments, NMR chemical shifts are
among the most powerful tools for strucutre elucidation of powdered solids or amorphous …

Benchmark fragment-based 1 H, 13 C, 15 N and 17 O chemical shift predictions in molecular crystals

JD Hartman, RA Kudla, GM Day, LJ Mueller… - Physical Chemistry …, 2016 - pubs.rsc.org
The performance of fragment-based ab initio1H, 13C, 15N and 17O chemical shift
predictions is assessed against experimental NMR chemical shift data in four benchmark …

A structure determination protocol based on combined analysis of 3D-ED data, powder XRD data, solid-state NMR data and DFT-D calculations reveals the structure …

CJH Smalley, HE Hoskyns, CE Hughes… - Chemical …, 2022 - pubs.rsc.org
We report the crystal structure of a new polymorph of L-tyrosine (denoted the β polymorph),
prepared by crystallization from the gas phase following vacuum sublimation. Structure …

Determination of a complex crystal structure in the absence of single crystals: analysis of powder X-ray diffraction data, guided by solid-state NMR and periodic DFT …

CE Hughes, GNM Reddy, S Masiero, SP Brown… - Chemical …, 2017 - pubs.rsc.org
Derivatives of guanine exhibit diverse supramolecular chemistry, with a variety of distinct
hydrogen-bonding motifs reported in the solid state, including ribbons and quartets, which …

Combining the advantages of powder X-ray diffraction and NMR crystallography in structure determination of the pharmaceutical material cimetidine hydrochloride

AE Watts, K Maruyoshi, CE Hughes… - Crystal Growth & …, 2016 - ACS Publications
We report the crystal structure of the anhydrous phase of cimetidine hydrochloride,
determined directly from powder X-ray diffraction data. The material was prepared by …

Experimentally Established 15N NMR Absolute Shielding Scale for Theoretical Calculations

IG Shenderovich - The Journal of Physical Chemistry A, 2023 - ACS Publications
The nitrogen atom of 2, 6-di-tert-butyl-N, N-diethylpyridin-4-amine (DEAP) is not available for
non-covalent interactions. This molecule has been used to define the reference 15N NMR …

Tautomerism and structure of azoles: nuclear magnetic resonance spectroscopy

LI Larina - Advances in heterocyclic chemistry, 2018 - Elsevier
This review provides comprehensive data (from the author's work and the literature) on
tautomerism of pyrazoles, imidazoles, 1, 2, 3-and 1, 2, 4-triazoles, tetrazoles …

Crystal engineering of pharmaceutical co-crystals:“NMR crystallography” of niclosamide co-crystals

D Luedeker, R Gossmann, K Langer… - Crystal Growth & …, 2016 - ACS Publications
Niclosamide is a Biopharmaceutics Classification System (BCS) class II taeniacide currently
reconsidered for new promising applications including treatment of rheumatoid arthritis …